This is crucial for fintech systems. Never assume all clients use the same currency.
Even if the app is local, think about future expansion or foreign currency transfers. Recording just the amount without currency is a recipe for disaster.
Proposed Model
- sourceAmount + sourceCurrency: Original client amount.
- convertedAmount + convertedCurrency: Amount after conversion.
- baseAmount + baseCurrency: System base currency value.
This ensures traceability, flexibility, and scalability. It might cost storage and speed, but business sustainability comes first.
#Fintech#LedgerDesign#Backend
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